CN104729235A - Fluidized bed material constant temperature control system and method - Google Patents
Fluidized bed material constant temperature control system and method Download PDFInfo
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- CN104729235A CN104729235A CN201510143084.9A CN201510143084A CN104729235A CN 104729235 A CN104729235 A CN 104729235A CN 201510143084 A CN201510143084 A CN 201510143084A CN 104729235 A CN104729235 A CN 104729235A
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Abstract
The invention provides a fluidized bed material constant temperature control system and method. A first-level material temperature PID control module K1 is newly added, and a control module K2 which can adjust temperature difference dynamically is added behind the material temperature PID control module. The control module K2 collects air inlet and material practical temperature difference in real time, a set value with temperature limitation is computed through the set value of air inlet and material temperature and is transmitted to an air inlet temperature PID control module K3, then the air inlet temperature PID control module K3 completes final control computing on a heating device, under the situation that material temperature is constant, the air inlet temperature practical value is limited between material temperature and the air inlet temperature set value all the time, material even heating is achieved, and the system and method can be suitable for materials in various temperature ranges.
Description
Technical field
The present invention relates to control field, particularly a kind of fluidised bed material thermostatic control system and control method thereof.
Background technology
Existing fluidised bed material temperature control scheme has two kinds:
Air intake thermostatic control: regulate EAT to make it reach constant by PID, temperature of charge does not participate in controlling.Dry run is illustrated in fig. 1 shown below, and the program controls simple, is applicable to the material that temperature resistant range is wider, and the characteristic that particularly temperature of charge can raise gradually along with water content reduction in drying process can directly be used as dry end-condition.But program temperature of charge can not be constant, freeze-day with constant temperature difficulty be carried out greatly, need operator manually to intervene; And in granulation/art for coating, material moisture is relevant to whitewashing process, and temperature of charge is more difficult stable, and manual adjustment workload is large, and temperature of charge fluctuation can cause medicine density, water content uneven, decrease in yield.
Direct material thermostatic control: regulate temperature of charge to make it arrive by PID constant, EAT does not participate in controlling.Dry run is illustrated in fig. 2 shown below, and the program adopts pid algorithm by the output of the direct control heater of temperature of charge deviation, and temperature of charge can be within the specific limits constant, but EAT is not controlled.The EAT of too high (or too low) is delivered to bottom material, can cause material hot-spot (or excessively cold) thus cause material to damage (as shown in Figure 3).Therefore the program uses face narrower, only can be used for the class material that temperature resistant range is very wide, less employing in actual product.
Summary of the invention
In order to overcome above technical deficiency, the invention provides a kind of fluidised bed material thermostatic control system.
The invention provides a kind of fluidised bed material thermostatic control system, it comprises EAT measuring appliance, EAT setting apparatus, temperature of charge measuring appliance and temperature of charge setting apparatus, described temperature of charge measuring appliance and temperature of charge setting apparatus are connected with temperature of charge pid control module by adder-subtracter, described EAT measuring appliance and EAT setting apparatus are connected with EAT pid control module by adder-subtracter, described EAT pid control module connecting positioner successively, heater, be connected with material bin after air intake processor, the measuring junction of described EAT measuring appliance is connected with the output of air intake processor, the described measuring junction of temperature of charge measuring appliance is connected with the output of material bin, described EAT setting apparatus and material constant temperature opening module of connecting between EAT pid control module, temperature of charge pid control module dynamic of connecting with material constant temperature opening module adjusts the control module of the temperature difference, described control module respectively with EAT setting apparatus, temperature of charge setting apparatus and the EAT measuring appliance after being connected by adder-subtracter are connected with temperature of charge measuring appliance.
The dynamic temperature that described control module reception EAT sensor and temperature of charge sensor detect in real time is poor.
Described EAT measuring appliance adopts temperature sensor.
Described temperature of charge measuring appliance adopts temperature sensor.
The invention also discloses a kind of control method for above-mentioned fluidised bed material thermostatic control system, its step is as follows: one, by temperature of charge setting apparatus setting temperature of charge SV2, by EAT setting apparatus setting EAT SV1, obtain actual temperature of charge PV2 by temperature of charge measuring appliance, obtain actual EAT PV1 by EAT measuring appliance;
Two, material constant temperature opening module is opened;
Three, first temperature value V1 is obtained by temperature of charge pid control module, then calculating is carried out to EAT measuring appliance and temperature of charge measuring appliance and obtain dynamic temperature △ PV, simultaneously to carry out the actual temperature of Real-time Collection air intake and material poor for control module, and go out the warm set-point limit of band by the preset value calculation of air intake and temperature of charge, i.e. the new settings value SV1 of the rear EAT of change;
Four, new settings value SV1 is inputted EAT pid control module, and calculates control temperature V2, and control temperature V2 is outputted to heater.
In step 3, temperature of charge pid control module is by V1=PID(SV2, PV2) obtain temperature value V1.
In step 3, △ PV=PV1-PV2.
Control module capping H=SV1, lower limit L=SV2, dynamically temperature limit M=SV2+ △ PV in step 3, first by judging that dynamically temperature limit M is in M>H, M<L or H>M>L, carry out M=H, M=L or M=H setting respectively, secondly by judging whether to be in dynamically lower limiting mode or dynamic upper bound pattern, carry out L=M or H=M setting respectively, finally draw SV1=SCALE(V1, H, L).
In described step 4, V2=PID(SV1, PV1).
When described material constant temperature opening module is not opened, directly skip step 3, carry out step 4.
The beneficial effect of the invention is: when ensureing that temperature of charge is constant, EAT actual value is limited between temperature of charge and EAT setting value all the time, realizes material thermally equivalent, can be suitable for the material of various temperature range comprehensively.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the thermostatically controlled dry run of air intake.
Fig. 2 is the schematic diagram of the thermostatically controlled dry run of direct material.
Fig. 3 is the thermostatically controlled structural representation of direct material.
Fig. 4 is system block diagram of the present invention.
Fig. 5 is schematic flow sheet of the present invention.
Fig. 6 is effect schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the present invention is further illustrated:
As shown in Figure 4, the invention provides a kind of fluidised bed material thermostatic control system, it comprises EAT measuring appliance T2, EAT setting apparatus, temperature of charge measuring appliance T3 and temperature of charge setting apparatus, described temperature of charge measuring appliance T3 and temperature of charge setting apparatus are connected with temperature of charge pid control module K1 by adder-subtracter, described EAT measuring appliance T2 and EAT setting apparatus are connected with EAT pid control module K3 by adder-subtracter, described EAT pid control module K3 connecting positioner T1 successively, heater E1, be connected with material bin B2 after air intake processor B 1, the measuring junction of described EAT measuring appliance T2 is connected with the output of air intake processor B 1, the measuring junction of described temperature of charge measuring appliance T3 is connected with the output of material bin B2, connect between described EAT setting apparatus with EAT pid control module K3 material constant temperature opening module S1, temperature of charge pid control module K1 dynamic of connecting with material constant temperature opening module S1 adjusts the control module K2 of the temperature difference, described control module K2 respectively with EAT setting apparatus, temperature of charge setting apparatus and the EAT measuring appliance T2 after being connected by adder-subtracter are connected with temperature of charge measuring appliance T3.
Newly-increased one-level temperature of charge pid control module K1, and the control module K2 increasing the dynamic adjustment temperature difference after this temperature of charge pid control module.The actual temperature of control module K2 Real-time Collection air intake and material is poor, and go out to be with the set-point of temperature limit to pass to EAT pid control module K3 by the preset value calculation of air intake and temperature of charge, then complete the final controlling calculation to heater by EAT pid control module K3.
The dynamic temperature that described control module K2 reception EAT sensor and temperature of charge sensor detect in real time is poor, and EAT sensor and temperature of charge sensor draw dynamic temperature difference by adder-subtracter, △ PV=PV1-PV2.
Described EAT measuring appliance adopts temperature sensor, for detecting EAT PV1.
Described temperature of charge measuring appliance adopts temperature sensor, for detecting temperature of charge PV2.
Described EAT pid control module and temperature of charge pid control module are all based on the pid control module of PID control principle design.
When ensureing that temperature of charge is constant, the present invention ensures that air intake is adjustable controlled simultaneously, namely guarantee that material is in temperature constant state always by material constant temperature opening module S1, then by the setting value of control module K2 to EAT and temperature of charge, then calculate with the actual temperature difference, draw the EAT value of real-time monitoring, ensure the adjustable controlled of EAT.
As shown in Figure 5, a kind of control method for above-mentioned fluidised bed material thermostatic control system, its step is as follows: one, by temperature of charge setting apparatus setting temperature of charge SV2, by EAT setting apparatus setting EAT SV1, obtain actual temperature of charge PV2 by temperature of charge measuring appliance T3, obtain actual EAT PV1 by EAT measuring appliance T2;
Two, material constant temperature opening module S1 is opened;
Three, first temperature value V1 is obtained by temperature of charge pid control module K1, then calculating is carried out to EAT measuring appliance T2 and temperature of charge measuring appliance T3 and obtain dynamic temperature △ PV, simultaneously to carry out the actual temperature of Real-time Collection air intake and material poor for control module K2, and go out the warm set-point limit of band by the preset value calculation of air intake and temperature of charge, i.e. the new settings value SV1 of the rear EAT of change;
Four, new settings value SV1 is inputted EAT pid control module K3, and calculate control temperature V2, and control temperature V2 is outputted to heater E1.
In step 3, temperature of charge pid control module K1 is by V1=PID(SV2, PV2) obtain temperature value V1.
In industrial processes, the state-variable such as temperature, pressure, flow, liquid level for process units usually requires to maintain numerically certain, or changes according to certain rules, to meet the requirement of production technology.Pid control module carries out bias adjustment according to PID control principle to whole control system, thus make the actual value of controlled variable consistent with the predetermined value of technological requirement.
In step 3, calculate dynamic temperature difference, △ PV=PV1-PV2.
Control module K2 capping H=SV1, lower limit L=SV2, wherein dynamic temperature limit M=SV2+ △ PV in step 3, first by judging that dynamically temperature limit M is in M>H, M<L or H>M>L, carry out M=H, M=L or M=H setting respectively, secondly by judging whether to be in dynamically lower limiting mode or dynamic upper bound pattern, carry out L=M or H=M setting respectively, finally draw SV1=SCALE(V1, H, L).
When dynamically temperature limits M higher than upper limit H, namely the upper limit is restricted to, M=H, then judges whether to be in dynamically lower limiting mode, when being in limiting mode dynamically, then lower limit is set, by L=M, then calculate temperature of charge and control to export, call linearization block SV1=SCALE(V1, H, L) draw the new settings value SV1 changing rear EAT; And be not in dynamically in limited time lower when it, then judge whether it is in dynamic upper bound, if then capping, H=M, then calculating temperature of charge controls to export, and calls linearization block SV1=SCALE(V1, H, L) draw the new settings value SV1 of EAT after change; If be not also in dynamic upper bound, then directly calculate temperature of charge and control to export, call linearization block SV1=SCALE(V1, H, L) draw the new settings value SV1 changing rear EAT.The new settings value SV1 of EAT after the change drawn is substituted original setting value SV1, realizes dynamic auto change.
When dynamically temperature limit M is lower than lower limit L, be restricted to lower limit, M=L, then judges whether to be in dynamically lower limiting mode, when being in limiting mode dynamically, then lower limit is set, by L=M, then calculate temperature of charge and control to export, call linearization block SV1=SCALE(V1, H, L) draw the new settings value SV1 changing rear EAT; And be not in dynamically in limited time lower when it, then judge whether it is in dynamic upper bound, if then capping, H=M, then calculating temperature of charge controls to export, and calls linearization block SV1=SCALE(V1, H, L) draw the new settings value SV1 of EAT after change; If be not also in dynamic upper bound, then directly calculate temperature of charge and control to export, call linearization block SV1=SCALE(V1, H, L) draw the new settings value SV1 changing rear EAT.The new settings value SV1 of EAT after the change drawn is substituted original setting value SV1, realizes dynamic auto change.
When dynamically temperature limit M is higher than L and lower than M, then directly judge whether to be in dynamically lower limiting mode, when being in limiting mode dynamically, then lower limit is set, by L=M, then calculate temperature of charge and control to export, call linearization block SV1=SCALE(V1, H, L) draw the new settings value SV1 changing rear EAT; And be not in dynamically in limited time lower when it, then judge whether it is in dynamic upper bound, if then capping, H=M, then calculating temperature of charge controls to export, and calls linearization block SV1=SCALE(V1, H, L) draw the new settings value SV1 of EAT after change; If be not also in dynamic upper bound, then directly calculate temperature of charge and control to export, call linearization block SV1=SCALE(V1, H, L) draw the new settings value SV1 changing rear EAT.The new settings value SV1 of EAT after the change drawn is substituted original setting value SV1, realizes dynamic auto change.
Wherein SCALE function by set-point linearly rule from set-point bound scope converting into target bound scope. its computing formula is: linearisation output=(set-point-set-point lower limit) ÷ (the set-point upper limit-set-point lower limit) × (target upper limit-target lower limit)+target lower limit, under default situations, the bound scope of set-point is: 0.0 ~ 1.0.
In described step 4, V2=PID(SV1, PV1).
When described material constant temperature opening module S1 does not open, then directly skip the computing of control module K2, former EAT SV1 is input to EAT pid control module K3.
Finally direct setting value SV1 after the change drawn is input to EAT pid control module K3, heater E1 is made to carry out temperature control according to the V2 obtained, when ensureing that temperature of charge is constant, EAT actual value is limited between temperature of charge and EAT setting value all the time, realize material thermally equivalent, can be suitable for the material of various temperature range, effect as shown in Figure 6 comprehensively.
Embodiment should not be considered as limitation of the present invention, but any improvement done based on spirit of the present invention, all should within protection scope of the present invention.
Claims (10)
1. a fluidised bed material thermostatic control system, it is characterized in that: it comprises EAT measuring appliance (T2), EAT setting apparatus, temperature of charge measuring appliance (T3) and temperature of charge setting apparatus, described temperature of charge measuring appliance (T3) and temperature of charge setting apparatus are connected with temperature of charge pid control module (K1) by adder-subtracter, described EAT measuring appliance (T2) and EAT setting apparatus are connected with EAT pid control module (K3) by adder-subtracter, described EAT pid control module (K3) connecting positioner (T1) successively, heater (E1), air intake processor (B1) is connected with material bin (B2) afterwards, the measuring junction of described EAT measuring appliance (T2) is connected with the output of air intake processor (B1), the measuring junction of described temperature of charge measuring appliance (T3) is connected with the output of material bin (B2), to connect between described EAT setting apparatus with EAT pid control module (K3) material constant temperature opening module (S1), temperature of charge pid control module (K1) dynamic of connecting with material constant temperature opening module (S1) adjusts the control module (K2) of the temperature difference, described control module (K2) respectively with EAT setting apparatus, temperature of charge setting apparatus and the EAT measuring appliance (T2) after being connected by adder-subtracter are connected with temperature of charge measuring appliance (T3).
2. fluidised bed material thermostatic control system according to claim 1, is characterized in that, it is poor that described control module (K2) receives the dynamic temperature that EAT sensor (T2) and temperature of charge sensor (T3) detect in real time.
3. fluidised bed material thermostatic control system according to claim 1 and 2, is characterized in that, described EAT measuring appliance (T2) adopts temperature sensor.
4. fluidised bed material thermostatic control system according to claim 1 and 2, is characterized in that, described temperature of charge measuring appliance (T3) adopts temperature sensor.
5. the control method for fluidised bed material thermostatic control system according to claim 1, it is characterized in that: its step is as follows: one, by temperature of charge setting apparatus setting temperature of charge SV2, by EAT setting apparatus setting EAT SV1, obtain actual temperature of charge PV2 by temperature of charge measuring appliance (T3), obtain actual EAT PV1 by EAT measuring appliance (T2);
Two, material constant temperature opening module (S1) is opened;
Three, first temperature value V1 is obtained by temperature of charge pid control module (K1), then calculating is carried out to EAT measuring appliance (T2) and temperature of charge measuring appliance (T3) and obtain dynamic temperature △ PV, simultaneously to carry out the actual temperature of Real-time Collection air intake and material poor for control module (K2), and go out the warm set-point limit of band by the preset value calculation of air intake and temperature of charge, i.e. the new settings value SV1 of the rear EAT of change;
Four, new settings value SV1 is inputted EAT pid control module (K3), and calculates control temperature V2, and control temperature V2 is outputted to heater (E1).
6. control method according to claim 5, is characterized in that, in step 3, temperature of charge pid control module (K1) is by V1=PID(SV2, PV2) obtain temperature value V1.
7. control method according to claim 5, is characterized in that, in step 3, and △ PV=PV1-PV2.
8. control method according to claim 5, it is characterized in that, control module (K2) capping H=SV1, lower limit L=SV2, wherein dynamic temperature limit M=SV2+ △ PV in step 3, first by judging that dynamically temperature limit M is in M>H, M<L or H>M>L, carry out M=H, M=L or M=H setting respectively, secondly by judging whether to be in dynamically lower limiting mode or dynamic upper bound pattern, carry out L=M or H=M setting respectively, finally draw SV1=SCALE(V1, H, L).
9. control method according to claim 5, is characterized in that, in described step 4, and V2=PID(SV1, PV1).
10. control method according to claim 5, is characterized in that, when described material constant temperature opening module (S1) is not opened, directly skips step 3, carries out step 4 operation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106647597A (en) * | 2016-10-11 | 2017-05-10 | 南京工业大学 | PLC (programmable logic controller) multi-stage temperature control method for fluidized bed catalytic combustion electric heating furnace |
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